I am a Senior Network Engineer 7-8 experience in design, deploy, developing and maintenance of big ISP network. Currently I am working at 2nd biggest ISP in my country. During my career I got experience with network a lot of vendors, especially with Cisco and Juniper. Also, for last few years, I am certified Engineer, who also teach Cisco(CCNA and CCNP Routing & Switcing) and Juniper(JNCIA-Junos and JNCIS-SP Routing & Switching) courses at a local academy called iNet Academy Moldova.
Since I am a Senior Engineer at ISP which network is build on Juniper an Cisco devices and we have more then 150k users with data, iptv and voip services, we were looking at different BRAS/BNG solutions, like Cisco ASR platform, Huawei ME, Ericsson SmartEdge, Juniper MX, and other software solutions. Finally, our decision fallen on a different solution, not Cisco ASR, but still, I have tested it a lot, and have integrated it with our FreeRadius. During my tests, I checked IPv4 connected subscribers, routed subscribers with rate limiting, redirect profiles and other stuff, as well as dual stack subscribers.
I think that I can help you with your task, as I already have done this before.